A
brass wire 1.8 m long at 27 °C is held taut with little tension
between two rigid supports. If the wire is cooled to a temperature of
–39 °C, what is the tension developed in the wire, if its
diameter is 2.0 mm? Co-efficient of linear expansion of brass = 2.0 ×
10–5
K–1;
Young’s modulus of brass = 0.91 × 1011
Pa.